I don't fucking care. - A full-blown rejection of everything you're being asked to d

A full-blown rejection of everything you're being asked to deal with. It’s like saying no, but with more swearing and less politeness.

I don't fucking care if you're still mad about the last fight.

I don't fucking care if your dog is still barking at the vacuum cleaner.

I don't fucking care if your neighbor is still playing loud music at 2 AM.